The Roger Bannister running track, also known as the Oxford University track, is a 400-metres athletics running track and stadium in Oxford, England. It was where Sir Roger Bannister broke the four-minute mile on 6 May 1954, when it was known as the Iffley Road track. The track is owned and operated by Oxford University. In 1867, Oxford University built a grass track 536 metres (0.333 mi) round at Marston Road Sports Grounds. It was built on clay and often flooded, or became unusable due to the wet conditions. The University later decided to build a new running track at Iffley Road. Building work began on the one-third of a mile (536 metres) track in September 1876 by the contractor Mr Hobdell. The ground was leased from Christ Church.